Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceddb671e3d5ddd0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 07:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95199454c8ebd47780e4b7cd646dc664 SHA-1: 46c99daeafc5247d54172e4916e2057561c9f863 SHA-256: ceddb671e3d5ddd0be52429931390bc994e58caffe651ded9cb90d3063ae2d4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the nature of the embedded URLs and the detection as a trojan suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://quick-thailand.com/images/uploads/file/nodekakogo.pdf In PDF document text
    • https://mimpisiluman.com/contents/files/vulomaginifewegetedinid.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0a1af61b---76962066237.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/wimiwop.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/ronum.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/92598045677.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/banevikabo.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/90985362535.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/93446514605.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/3314451694.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f52734b9---wimututatudesosenovup.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/bomukazosemifumogiduji.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/lunalajixesanutakibizev.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/17265475331.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/040923453163.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/76120610583.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/51958788223.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/datinar.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/vezivexakaletazugidoj.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/75675053696.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/mukevemonilatalu.pdfIn PDF document text
    • http://klenderbio.com/upload/files/lanatarajefuzoxuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=word+to+pdf+converter+offline+installPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 17044 bytes
SHA-256: e26e7ab767086346c580646c479c67445185c9cee6dff387707db7741b16753a
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 10672 bytes
SHA-256: 85dd4d2c3cc8460044fc2ffcd61b2fcd71053062bf9f031058230fdf8e5a9578

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